Classificação de germoplasma de Dioscorea sp. através da análise das componentes principais

Filho, Péricles de Albuquerque Melo; Santos, Roseane Cavalcanti dos; Santos, Rivaldo Chagas Mafra José Weilinghton dos; Filho, Clodoaldo José da Anunciação

doi:10.1590/s0103-84782000000400010

Cited by 4 publications

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“…Onyilagha (1986) evaluated 14 D. rotundata accessions using morphological characters, and concluded that the characters with higher discriminatory power were leaf size, tuber size, size of flower spikelets per node and spikelet length. Melo Filho et al (2000) characterized morphologically 11 accessions of Dioscorea spp. from the yam collection of the Federal Rural University of Pernambuco, and observed that among the analysed traits, the length and width of the leaf had the highest contribution in discriminating the accessions.…”

Section: Discussionmentioning

confidence: 99%

“…Some authors consider them to be two different species (Tostain et al , 2007; Bressan et al , 2014), while others consider both as part of a species complex (Dansi et al , 2001, 2013; Mignouna et al , 2002; Zannou et al , 2009; Girma et al , 2014). Several studies have used morphological markers to measure the genetic diversity of these species (Onyilagha, 1986; Dansi et al , 1999; Melo Filho et al , 2000; Bressan et al , 2014; Girma et al , 2014; Loko et al , 2015). Among the molecular markers, microsatellites or SSR (simple sequence repeats) stand out for their efficiency, and for being multi-allelic, co-dominant, and showing a simple Mendelian segregation (Agarwal et al , 2008).…”

Section: Introductionmentioning

confidence: 99%

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Spatially structured morphological and molecular diversity amongDioscorea cayenensisandD. rotundatayam accessions

Silva¹,

Mezette

Nascimento

et al. 2016

Plant Genet. Resour.

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Yams (Dioscorea spp.) are one of the main root and tuber crops in the world, especially within the species complex Dioscorea cayenensis/D. rotundata. Few studies have been conducted in Brazil with these species, including genetic diversity. The objective of this study was to characterize the genetic diversity of local varieties of D. cayenensis and D. rotundata using morphological and molecular markers, and provide information on the management and use of the crop by family farmers from different regions in Brazil. Thus, yam tubers were sampled from several municipalities in the South, Southeast and Northeast regions. Eighteen morphological traits and ten microsatellite loci were used to analyse 47 yam accessions (23 D. cayenensis and 24 D. rotundata). Species identification was carried out after field morphological evaluation. Spatial genetic analysis indicated significant structure among the local varieties, mostly between regions and species. Both cluster and Bayesian analyses showed a separation of the accessions into two distinct groups: group I with accessions originated from the Southeast region and group II with accessions originated from the Northeast region, while accessions from the South region were intermediate or included in either group. The results showed a separation between D. cayenensis and D. rotundata accessions in Brazil, and that D. cayenensis occurs predominantly in the Southeast region, while D. rotundata occurs in the Northeast region. Further studies with larger sampling would be welcome in order to confirm these findings. Also, this study highlights the importance of family farmers in the genetic diversity conservation of these species in Brazil.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatially structured morphological and molecular diversity amongDioscorea cayenensisandD. rotundatayam accessions

Silva¹,

Mezette

Nascimento

et al. 2016

Plant Genet. Resour.

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Distribution, management and diversity of the endangered Amerindian yam (Dioscorea trifida L.)

et al. 2015

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The objective of this study was to verify the occurrence of Dioscorea trifida in Brazil and to obtain information concerning its distribution, management and diversity. Farmers from 21 communities were interviewed in the states of São Paulo, Santa Catarina and Mato Grosso. During the visits, semi-structured interviews were conducted to collect socio-economic, management and diversity data for this crop. Fifty-one collected accessions, plus two accessions obtained at local markets of Amazonas, were characterized using 12 morphological traits. Most the interviewed farmers were men (75%) with a mean age of 59.5 years. Just a few young people and labor force were available for agricultural activities, with an average of only three individuals per farm. Most farmers (56%) grew only one variety of D. trifida, although 44% had more than one variety in their fields, which aims to provide greater assurance at harvest. Many popular names were observed for D. trifida, and cará roxo (purple yam) was the name most used by farmers (43.4%). Characters referring to the tuber, such as skin and flesh color, were most relevant for the distinction of the accessions. The results of this study may collaborate to develop strategies for conservation, both ex situ and in situ, within the view of on farm conservation. Keywords

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Caracterização morfológica de espécies de trapoeraba (Commelina spp.) utilizando a análise multivariada

2007

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RESUMO -As espécies Commelina benghalensis , C. villosa, C. diffusa e C. erecta são conhecidas como trapoeraba e, freqüentemente, são confundidas entre si, dificultando o controle químico, o que pode provocar prejuízos econômicos e danos ambientais. O presente trabalho teve como objetivo selecionar características morfológicas que possibilitem facilitar a identificação dessas espécies, utilizando a técnica de análise multivariada. Foram avaliadas 12 características morfológicas descritivas e 13 quantitativas, utilizando-se os métodos de análise de agrupamento e análise de componentes principais. As espécies apresentaram alto grau de dissimilaridade, sobretudo em relação às características descritivas, destacandose: háb ito da pla nta, pilosidad e do caule e da folha, entre outros. As característic as quantitativas também mostraram poder discriminatório. Características que apresentaram alto valor taxonômico foram selecionadas para compor a chave de identificação para as quatro espécies de Commelina. Palavras-chave:

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Classificação de germoplasma de Dioscorea sp. através da análise das componentes principais

Cited by 4 publications

References 1 publication

Spatially structured morphological and molecular diversity amongDioscorea cayenensisandD. rotundatayam accessions

Spatially structured morphological and molecular diversity amongDioscorea cayenensisandD. rotundatayam accessions

Distribution, management and diversity of the endangered Amerindian yam (Dioscorea trifida L.)

Caracterização morfológica de espécies de trapoeraba (Commelina spp.) utilizando a análise multivariada

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